Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7de7dfe8ef65d2…

MALICIOUS

PDF

110.3 KB Created: 2021-06-28 14:06:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 0d7ae8f21b8bc33a298b57758df711a9 SHA-1: 0bfe53cc20867504ed82239103fb0c57fcd24361 SHA-256: ec7de7dfe8ef65d2b0e6eff6a88ac04a415063e9a3e12fec9b2eca92049df963
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites that host other PDFs. The primary purpose appears to be directing users to malicious content, likely for phishing or to download further malware. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/dbd3c0dc6e98000c66acb17f8c4d308f/84269590463.pdf In PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c8edfb74e91---38262143783.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/f171c51e41fc7ab23ab57031aa2a094b/74432503232.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/3da75f23845a9794f1813130b155fdcb/kidunoku.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/pn570j9d6eoom38j9628r7uka2/10718152458.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/7ff722ec06e7ad71fd32a92e0dd36311/ludekarebomuripudoga.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/99055914258.pdfIn PDF document text
    • http://shreyaghoshal.com/konadnew/userfiles/file/kerubumudad.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be04a2f0789---25233336311.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/retamugezilodipolexez.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a109ae064ed---tupigomudawavuviwipixes.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1607540be350e3---70965380679.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f505b659b4---sebozos.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/e21fadaa81592d8511b76bdd10583ed7/93469429476.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/obmepu7l6fbiqgm8p9nc3c8l3e/99765037045.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/1p14vb3sbj4kf8rp2eiij0r0ur/27471064139.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/gepaneb.pdfIn PDF document text
    • https://jxloanchien.com/style/postimage/file/liwesavumekokebor.pdfIn PDF document text
    • http://casier-a-bouteilles.fr/file/lumumijawexozesakifijozu.pdfIn PDF document text
    • https://nistd.in/userfiles/file/94589084208.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/tapoveronugili.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/d73d72a32055a82ed02bb3a2fb570078/jumiborurifunuviwob.pdfIn PDF document text
    • http://elise.pe/images/file/92485741591.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/21660356092.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/a8997f8670775701be5cb2bae43ec1ea/nezobif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=with+his+consentPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00016050.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16050 22320 bytes
SHA-256: c6cb88a8c9c9376200b67867716a5cece2b27fa7dfef198824b13ac5e1aab7c5
font_00_sfnt_off00010a3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A3D 26648 bytes
SHA-256: 675c86478dbc5fcead7cdee1262b1ba06d1d57bf7177ecf15de003eecae4673c
font_01_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 10012 bytes
SHA-256: f00673fd485d731a6bbc03c80303dffaba62cf9404434002a65a7e24cd262293
font_03_sfnt_off00018859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001a066.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A066 2408 bytes
SHA-256: 02a2cb5d502ff69aec2724b4c3562ce27a182a7f423d1d6dc33e82f085af272e

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